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Table 1 Main characteristics of the included studies

From: Meta-analysis of laparoscopic anterior resection with natural orifice specimen extraction (NOSE-LAR) versus abdominal incision specimen extraction (AISE-LAR) for sigmoid or rectal tumors

Study Year Region Study design Participates (counting) Age a (year) Gender (male/female) Tumor location Specimen extraction site NOS score
NOSE-LAR group AISE-LAR group NOSE-LAR group AISE-LAR group NOSE-LAR group AISE-LAR group
Hisada et al. 2014 Japan Retrospective study 20 50 63.7 (9) 66.3 (11) 12/8 NR Rectum Anus 5
Hu et al. 2019 China Retrospective study 26 26 63.1 (8.3) 61.5 (7.6) 17/9 15/11 Rectum Anus 7
Ng et al. 2018 China Retrospective study 35 38 65.14 (9.14) 63.95 (9.19) 20/15 22/16 Sigmoid or rectum Anus 8
Zhang et al. 2014 China Retrospective study 65 132 56.1 (9.3) 55.5 (9.5) 32/33 57/75 Sigmoid or rectum Anus 6
Zhou et al. 2019 China Retrospective study 52 52 55.6 (10.4) 57.0 (10.7) 27/25 27/25 Sigmoid or rectum Anus 8
Xing et al. 2017 China Retrospective study 16 32 61.9 (11.8) 62.4 (12.0) 12/4 24/8 Sigmoid Anus 7
Liu et al. 2019 China, Russia Retrospective study 356 412 64 (29–79) 62 (32–81) 192/164 235/177 Rectum Anus or vagina 6
Saurabh et al. 2017 Taiwan Retrospective study 82 106 63.3 (13.9) 64.7 (10.9) 47/35 65/41 Sigmoid or rectum Anus 6
Denost et al. 2015 France Retrospective study 122 98 63 (20–90) 65 (25–85) 70/52 69/29 Rectum Anus 7
Wang et al. 2019 China Retrospective study 30 37 58.67 (8.45) 59.70 (10.88) 19/11 20/17 Rectum Anus 7
  1. Abbreviations: NOSE-LAR laparoscopic anterior resection with natural orifice specimen extraction, AISE-LAR laparoscopic anterior resection with abdominal incision specimen extraction, NOS Newcastle-Ottawa Scale, NR not record
  2. aReported as mean ± standard deviation or median (range)